Shipping it to Africa would be the problem, it'd have to be shipped QUICKLY and shipped with cold packs. Heat will damage the insulin. It'll take a lot for it to be completely useless/dead, but it will be weaker if exposed to too much heat for too long.

Different insulins metabolize at different rates. R, L, N, U, Lantus, 70/30, ect... If you can get Lantus, she can do a single shot per day.